Eraser cleaning machine



Dec. 22, 1953 c GILBERT ERASER CLEANING MACHINE 2 Sheets-Sheet 1 Filed Oct. 9, 1951 Dec. 22, 1953 c, GlLBERT 2,663,044

ERASE CLEANING MACHINE Filed Oct. 9, 1951 2 Sheets-Sheet 2 35 5 s L. 6W2??? eraser cleaning modelhave found. H i Another object of the invention lies in-the Patented Dec. 22, 1953 J's-513 3:;

UNITED STATES PATENT OFFICEJ ERASER CLEANING MACHINE Charles L. Gilbert, Spokane, Wash., assignor to Donald Black, Spokane, Wash.

- Application October 9, 1951, Serial No. 250,499

My present invention is an eraser cleaning machine.

the resultant impaction 'will cause the chalk dust to be jolted outof the erasers whereupon it is removed by air currents passing through the drum-.- 1 V 'Anotherfobject of 'the' invention lies in the provisionof an eraser cleaning machine which is very effective in its function of cleaning erasers and simple to operate and having a minimum number of parts arranged according to the best provision of a novel journal arrangement for the drum which very effectivelymounts the drum for rotation and permits the; passage of air through the journalto the fan to carry away the chalk removed from the erasers.

Another object of the invention lies in the provision of an eraser cleaner which is driven by an electric motor and at a reduced speed and the same motor adapted to operate a fan for effecting air currents through the drum of the eraser cleaner.

These and other objects will be apparent during the course of the following description.

In the accompanying drawings, forming a part of this specification, and in which like numerals are employed to designate like parts,

Figure 1 is a perspective view of the improved eraser cleaner embodying my invention,

Figure 2 is a longitudinal cross section taken through the machine,

Figure 3 is a transverse cross section of the tumbler drum as if taken at line 3-3 of Fig. 2,

Figure 4 is a transverse cross section of the cylindrical journal as at line 4-4 of Fig. 2,

Figure 5 is a transverse cross section of the drum looking at the foraminous head along the line 5-5 of Figure 2, and,

Figure 6 is a fragmentary longitudinal cross section of the cylindrical journal and its associated parts.

Referring now more particularly to the drawings, I have shown my improved eraser cleaning machine as having a housing I!) which is divided into two sections as a drum housing II and a motor housing I2. The drum housing is provided with an open top 13 and a closure 14 therefor hingedly secured at I5 to the upper portion of a wall IS. A suitable handle I1 is provided to permit on to easily operate the closure l4.

machine having a revolving tumbler drum whichwill tumble the erasers and 1 Claim. (01. 15-305) Opposed to wall It is a second wall l8 which carries outwardly spaced andupwardly disposed fingers l9 thereon. The motor housing section It is provided with a depending lip 29 at its upper adjoining edge, and this lip 20 hooks behind fingers l9 to removably secure the housing sections together with the section !2 spaced upwardly at its lower edge to provide additional area for air discharge over that of louvers 2!.

The flrst named wall [6 of thehousing II has an air ingress opening 25 consisting of a relatively large aperture 22 in the wall and a screen 23 secured in covering relation by a rim 24 having fasteners. A length of angle iron 25 is secured to the wall in horizontal position and a bearing 21 is supported thereby at the transverse center of air ingress opening 25.

Opposed wall [8 is formed with an air egress opening 28 and has an air seal 29 which consists of an air sealing felt strip 30 encircling the opening 28 and being secured to the wall 18 by means of a retaining ring 3|. Spaced below the opening a horizontally disposed angle iron 32 is secured to the wall [8 and spaced rollers 33, carried by brackets 34, are supported thereon and secured by bolts 35.

Externally of wall IS, a fan 36 is secured with its centric intake 31 in registry with said air egress opening 28 and the fan is provided with a peripheral discharge 38 which may lead through suitable duct work (not shown) to the atmosphere or, the discharge may be connected to a suitable collecting bag (not shown) whereby the dust may be collected in a porous container which will permit the air to escape.

A bracket 39 is secured to wall [8 externally of the housing section II and serves to mount a motor 40 in axial alignment with fan 36. The shaft 41 operably connects fan 36 to the motor 40 and intermediate the fan and motor carries a pulley 42 having a belt 43 trained thereon, and also on a spaced pulley 44 of larger diameter and carried by a stub shaft 45. The shaft 45 is rotatably supported in a bearing block 46 carried by wall I8 and has a flat belt pulley 41 on its opposed end disposed within housing section II. It can be seen that motor 4|] will thus drive fan 36 at a desirable speed and pulley 41 at a reduced speed. 7

Within housing section II I have provided a revolvable eraser tumbling drum 48 which has a cylindrical body 49 having one end closed with a foraminous head 50 and the opposed end closed by an end wall 5i. Within the drum and about its inside circumference, multiple eraser lifters 52 are secured parallel to the axis of the drum and are adapted to lift the erasers as the drum revolves, causing them to tumble and the resultant impaction to jolt the chalk dust from the erasers. A peripheral sliding door 53 removably covers an opening for passing erasers into and out of the drum.

End wall 5| is provided with a centric opening or aperture 54 through which extends a cylindrical journal 55 and the journal is secured therein as by Welding thus forming inner and outer end portions 56 and 51. About the outer end portion 57, I have provided a wear ring 58 of a semi-resilient material such as leather and this is secured thereon as by rivets 59. .The wear ring 58 is positioned to roll upon rollers 33 and thus support the journal in communication with the air egress opening 28; Thephy'sioal characteristics of the wear ring are such that the wear of the rollers is at a minimum, and the noise of the rolling action is eliminated.

Within its inner end 55, journal 55 is provided with a spider 50 which is adapted to centrically support one end of shaft 6! which extends through the drum and beyond its foraminous head 50 where it is rotatably supported in a bearing 21' on wall 15.

Trained about the drum adjacent the end thereof, is a fiat belt 62 which is also trained about the pulley, and because of the great variation in size, the rotation of drum :38 is greatly reduced from the speed of the pulley '41, the drum is thus revolved. slowly to cause the erasers therein to tumble and impact against each other and shaft 6| to jolt the chalk dust out of them.

It can be plainly seen from the above description that I have provided a revolvabledrum having means for tumbling erasers therein and also means'for creating air currents through the drum seal about said air egress opening for sealing said opening and journal against leakage, a leather wear ring riveted'about said journal, a pair of I spaced rollers carried by said second named wall and cooperating with said wear ring to rotatably support said journal, a spider in said journal, a shaft supported at one end in said spider, a bearing on said one wall and rotatably supporting the opposed end of said .shaftyan eraser tumbling drum including a foraminous head secured to the shaft adjacent said bearing and an end .wall opposed to saidhead and secured about said journal, whereby said journal communicates with said drum, and means for revolving said drum.

CHARLES L. GILBERT.

7 References Cited in the file of this patent UNITED STATES PATENTS "Number 'Name Date 830,377 Shannon 'et al Sept. 4, 1906 974,096 Scott I Oct. 25, 1910 1,163,283 Thompson i Dec. 7, 1915 1,163,284 Thompson Dec. 7, 1915 1,446,456 Frazee, Jr; "Feb. 27, 1923 2,152,140 Gilbert Mar. 28, 1939 2,172,914 Seams Sept. 12, 1939 2,438,995

Forney Apr. 6, 1948 

